Rotator Cuff Exercises

After my shoulder workout I performed a few sets (20 reps) with cables on rotator cuffs to the side with bent arm and straight up as shoulder aching and pec feeling tight.  The bent arm exercise caused clicking/crunching every time and was painful and this felt like it was due to tightening of the upper pec.  I massaged upper pec while doing this exercise and clicking/crunching/pain stopped!!!

Is this the cause of my shoulder problem…a tight pec pulling shoulder out of position???